The tuberculin test or the Mantoux test is a study that came to us from the 19th century and is still widely used as a test for detecting tuberculosis. Despite the frequent holding of Mantoux by doctors all over the world, this reaction has its own difficulties and contradictions. One of the nuances is the question of how much you can not wet Mantoux. Let's try to figure it out.
Mantoux reaction and Pirke's test - the names are different, the essence is the same
Tuberculosis ranks first among other diseases in the number of deaths in the world. The combination of certain factors, including high costs, limited resources and poor performance of various diagnostic tests, make the diagnosis of this disease difficult.
Often, the tuberculin test is the only method for detecting a tuberculosis infection that is used in the diagnosis of the disease in individual patients, as well as in epidemic conditions, to determine its prevalence among the population. Conducting Mantoux in any group of patients, as a rule, gives a wide range of possible results: from the presence of a reaction in uninfected people to its complete absence in some with confirmed tuberculosis.
How is the test done?
The standard dose of tuberculin - five units of 0.1 ml volume is injected subcutaneously and checked after 48 hours. For injection, purified protein derivative is most commonly used. Usually the test is done on the left forearm to avoid reading errors. Nevertheless, the use of the right hand is not excluded.
After the Mantoux reaction has been carried out, it is necessary to fulfill all the doctor's prescriptions in order to prevent distortion of the results. Check results should be in a well-lit place. The presence or absence of a seal on the forearm is determined visually and by palpation. The diameter of the papule is measured in the transverse direction to the longitudinal axis of the forearm and fixed in millimeters:
- papule size less than 5 mm is not of interest;
- 10 mm is a sign of possible contact with a patient with an active form of tuberculosis or being at risk;
- 15 mm in combination with specific skin reactions is a probable infection.
Mantoux shows the response of the organism to the pathogen. A positive reaction on the skin at the injection site indicates a possible contact with the pathogen, but does not give a definite answer about the presence of the disease in the body. And this is important to consider.
Reliable skin sample reading requires standardization of procedure, preparation, control and practice. The exact measurement of papules in millimeters should be recorded. At the same time redness should not be measured.
How many days can not wet vaccine Mantu?
Many people think that after a tuberculin test one cannot eat sweets, and also wet the place of vaccination. Myths is it or the truth? Let's see. When it comes to a beloved child, parents are ready to do anything to avoid any negative consequences. Opinion on the ban on the consumption of sweets during the test period is not confirmed. It can be said that sweet foods have no influence on the size of papules.
However, some foods that can cause an allergic reaction in the body or an increased sensitivity may contribute to a false-positive result. It can be citrus and chocolates, that is, those products where the sugar content is high. The same effect can lead to clothing made of synthetic synthetic yarn.
How many days it is impossible to wet Mantoux in a child is the most common question of parents. The answer is simple: three days. This is the period after which the health worker will check the test result. In fact, water has no effect on the Mantoux sample, administered subcutaneously. Although it is necessary to take into account the fact that the injection site does not need to be subjected to any physical or chemical effect, that is, it must be treated with drugs, glued, bandaged, scratched, damaged. These actions may distort the results of the sample.
Experts are inclined to consider the emergence of the myth of the negative effect of water on the Mantoux test from the times when the Pirque sample was used, since it consisted in the scarification of the skin area, where it was directly applied. This very place was really forbidden to wet in the water.
Another myth not confirmed by scientific arguments and research is the assertion by opponents of such health checks that there is a link between leukemia disease and tuberculin tests.
Knowing how many days it is impossible to wet Mantoux in a child does not cancel communication with the pediatrician and the exact implementation of his recommendations. The specialist will answer all your questions and explain the nuances in case of a misunderstanding of the process. It should be borne in mind that even with a positive response about the possibility of exposing the Mantoux reaction to water, it is not worthwhile to arrange abundant bathing procedures. You should also avoid all sorts of damage on the skin with the sample, including the need to exclude products that can cause sensitization of the body and the subsequent distortion of the test results.